Understanding the redistribution and retention of chromium(VI) (Cr(VI)) co-precipitated with silicate-containing ferrihydrite during aging is essential to the stabilization and immobilization of Cr(VI) in nature. In this work, Cr(VI) was removed by co-precipitated with silicate-containing ferrih...
Batch tests were conducted to investigate molybdate removal in a hybridized zero-valent iron/Fe3O4/Fe(II) system (hZVI) in comparison with a conventional ZVI system. The hybrid system was created by employing a nitrate-Fe2+ pretreatment method to coat the ZVI grains with a magnetite (Fe3O4) surf...
In this investigation, batch and miscible displacement experiments were performed to investigate the pH-dependent effect on retention and transport of Mo(VI) on iron oxide-coated sand (IOCS). Measured results indicated that Mo(VI) sorption was strongly nonlinear and kinetically controlled, where...
Nanoscale zerovalent iron (nZVI) shows great promise in valuable metal recovery from wastewater due to its high removal capacity. However, nZVI-based processes mainly focus on the sequestration step, ignoring the desorption step, which is crucial for recovery. In this study, a novel method for s...
Nanoscale zerovalent iron (nZVI) has been proposed to remediate heavy metal ions in the subsurface. However, the fate of metal-nZVI hybrid has not been fully investigated. In this study, we investigated (1) the long-term removal performance of nZVI for molybdate (Mo(VI)); (2) the relationship be...
It was demonstrated that iron molybdate catalysts for methanol oxidation can be prepared using Fe(II) as a precursor instead of Fe(III). This would allow for reduction of acidity of preparation solutions as well as elimination of Fe(III) oxide impurities which are detrimental for the process sel...
A series of nine bis(arylimino)pyridine iron complexes containing halogen or alkynyl substituents in their ligand frameworks was synthesized and characterized. After activation with methylalumoxane (MAO), these catalysts oligomerize or polymerize ethylene to give highly linear products. The intr...
Carbon monoxide releasing molecules (CORMs) deliver controlled amounts of CO to biological targets and organs. The reaction of cysteamine with triirondodecacarbonyl yields dicarbonyl bis(aminoethylthiolato)iron(II) that represents an iron-based CORM with biogenic ligands. X-ray diffraction studi...
The LOHAFEX iron fertilization experiment consisted in the fertilization of the closed core of a cyclonic eddy located south of the Antarctic Polar Front in the Atlantic sector of the Southern Ocean. This eddy was characterized by high nitrate and low silicate concentrations. Despite a 2.5 fold ...
The alluvial plains of Upper Yamuna basin covers a vast area of around 11,500 sq. km. It has been reported that extensive agriculture and urbanization has led to release of various contaminants in river as well as groundwater system in the study area. Iron concentration in water has its bearing ...
The properties of polyolefin resins depend very much on their molecular weights, the amount of side chain branchings and molecular weight distributions. One way to obtain such tailored products in only one reaction step consists in the application of dissymmetric multi nuclear catalysts with dif...
During the extraction of vanadium from stone coal by pressure acid leaching, a large amount of aluminum and iron are dissolved along with vanadium, which increases the difficulties of purification and enrichment of the leaching solution. In this study, the separation of aluminum and iron from va...
Iron can be precipitated out of leaching solutions by using high pressure processes. The focus of this study is on the various iron phases forming during the pressure oxidation of sulfates. Artificial solutions were produced from sulfuric acid, copper and iron sulfates in an attempt to recreate ...
Piperazinium(2+) selenite monohydrate and piperazinium(2+) diselenite were prepared by crystallization from aqueous solutions. The crystal structures of both substances were solved. Piperazinium(2+) selenite monohydrate crystallizes in the monoclinic space group P21/c, a=12.308(2), b=6.5530(7), ...
An ion chromatographic method for the determination of selenite and selenate using both Zeeman-effect graphite furnace atomic absorption spectrometry (GFAAS) and Zeeman-effect flame atomic absorption spectrometry (FAAS) for selenium-specific detection is described. Different mobile phases were i...
The new selenite-chlorides with composition Sr3(SeO3)2Cl2 (I) and Sr2M(SeO3)2Cl2 (M=Co, Ni (II and III)) were obtained. They crystallize in monoclinic system I: space group C2/m, a=13.203(2) Å, b=5.5355(8) Å, c=6.6170(10) Å, β=95.89(1)°, Z=2; II Space group P21/n, a=5.3400(10) Å, b =6.4279(6) ...
Four new quaternary vanado-tellurites and vanadyl-selenites, namely, SrVTeO5(OH)(1), Cd2V2Te2O11(2), Ca3VSe4O13·H2O(3) and Ba2VSe3O10(4) have been synthesized and structurally characterized by single crystal X-ray diffraction. The oxidation state of vanadium is +5 in tellurites 1 and 2 and +4 i...
ObjectiveThe aim of this study was to determine whether there is a correlation between acid erosion and fluoride release of conventional glass ionomer cements.
Fluorotellurite glasses based on zinc and barium fluorides with total dopant concentration limited to 40 mol% in tellurite glass matrix were obtained by melt quenching technique. Explicit effects of both the zinc and barium fluorides on the tellurite glass network were observed from their respon...
The microscopic processes leading to material removal from sodium chloride (1 0 0) and barium fluoride (1 1 1) surfaces upon irradiation with near infrared femtosecond laser pulses are investigated using time-of-flight mass spectroscopy of charged particles. A pump–probe excitation setup permit...
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